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United States Patent | 6,030,598 |
Topham ,   et al. | February 29, 2000 |
An ozone containing gas stream is produced from oxygen by subjecting oxygen to an electric discharge and the ozone is then adsorbed on to a solid adsorbent, such as zeolite, the oxygen containing stream leaving the adsorbent is recycled to the ozonising process. Periodically, oxygen adsorbed on the adsorbent is desorbed by co-currently passing a purge gas over the adsorbent and the desorbed oxygen is also recycled to the ozoniser. Lastly ozone is desorbed from the adsorbent by a counter-current flow of purge gas and used in an ozone demanding process.
Inventors: | Topham; Anthony K. J. (Walton-on-Thames, GB); Allam; Rodney J. (Guildford, GB) |
Assignee: | Air Products and Chemicals, Inc. (Allentown, PA) |
Appl. No.: | 093209 |
Filed: | June 8, 1998 |
Jun 11, 1997[DE] | 9712165 |
Current U.S. Class: | 423/581; 95/90; 95/116; 95/138; 423/659 |
Intern'l Class: | B01D 053/02; B01D 053/04; C01B 013/10 |
Field of Search: | 95/138,90,116 423/659,581 |
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4604279 | Aug., 1986 | Leitzke et al. | 423/581. |
4786489 | Nov., 1988 | Grenier et al. | 423/581. |
4863497 | Sep., 1989 | Grenier et al. | 55/181. |
5507957 | Apr., 1996 | Garrett et al. | 210/760. |
5520887 | May., 1996 | Shimizu et al. | 422/186. |
5810910 | Sep., 1998 | Ludwig et al. | 95/138. |
5846298 | Dec., 1998 | Weist, Jr. | 95/138. |
Foreign Patent Documents | |||
658719 | Mar., 1992 | AU | . |
61-306348 | Dec., 1986 | JP | . |
3-16638 | Jan., 1991 | JP | . |
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